Abstract
Due to their relevance and occurrence in both natural phenomena and in industrial
applications, the study and understanding of bubbly flows is currently an important
topic for fluid dynamicists. Bubble columns are commonly used in bio- and petrochemical
industries to enhance mixing, mass and heat transfer. In these systems, the
bubbles are the only energy input as there is no flow a priori. Bubble columns are also
referred to as pseudo-turbulence because the bubbles induce liquid fluctuations in the
originally quiescent liquid. These disturbances are the result of the hydrodynamic
interactions among the bubbles and their heterogenous distribution.
Turbulent flows transporting particles are ubiquitous in nature, being of such relevance
in diverse fields ranging from atmospheric physics to oceanography. Usually
the convected particles have a different density and size than the transporting fluid,
turbulent bubbly flows are a particular case of them. In recent years, Lagrangian
studies—i.e. studies following the particle motion—of particles in turbulence have
gained considerable attention because this approach is closer to the inherent mixing
and transport characteristic of turbulence. Yet there is still the challenge and interest
to comprehend more the Lagrangian statistics of particles in turbulence.
This work studies bubbly flows in two different flow conditions. In the first part,
we study the pseudo-turbulence induced by rising bubbles in quiescent liquid. In the
second part, we study the Lagrangian statistics and clustering of micro-bubbles in
homogeneous isotropic turbulence.
Original language | English |
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Awarding Institution |
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Supervisors/Advisors |
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Award date | 15 Jul 2011 |
Place of Publication | Enschede |
Publisher | |
Print ISBNs | 9789036532204 |
DOIs | |
Publication status | Published - 15 Jul 2011 |
Keywords
- METIS-277029
- IR-77723